The Tcpdump Group git mirrors - tcpdump/blob - print-atalk.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Format and print AppleTalk packets.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include <stdio.h>
  31 #include <string.h>
  32
  33 #include "netdissect.h"
  34 #include "addrtoname.h"
  35 #include "ethertype.h"
  36 #include "extract.h"
  37 #include "appletalk.h"
  38
  39 static const char tstr[] = "[|atalk]";
  40
  41 static const struct tok type2str[] = {
  42         { ddpRTMP,              "rtmp" },
  43         { ddpRTMPrequest,       "rtmpReq" },
  44         { ddpECHO,              "echo" },
  45         { ddpIP,                "IP" },
  46         { ddpARP,               "ARP" },
  47         { ddpKLAP,              "KLAP" },
  48         { 0,                    NULL }
  49 };
  50
  51 struct aarp {
  52         uint16_t        htype, ptype;
  53         uint8_t         halen, palen;
  54         uint16_t        op;
  55         uint8_t         hsaddr[6];
  56         uint8_t         psaddr[4];
  57         uint8_t         hdaddr[6];
  58         uint8_t         pdaddr[4];
  59 };
  60
  61 static void atp_print(netdissect_options *, const struct atATP *, u_int);
  62 static void atp_bitmap_print(netdissect_options *, u_char);
  63 static void nbp_print(netdissect_options *, const struct atNBP *, u_int, u_short, u_char, u_char);
  64 static const struct atNBPtuple *nbp_tuple_print(netdissect_options *ndo, const struct atNBPtuple *,
  65                                                 const u_char *,
  66                                                 u_short, u_char, u_char);
  67 static const struct atNBPtuple *nbp_name_print(netdissect_options *, const struct atNBPtuple *,
  68                                                const u_char *);
  69 static const char *ataddr_string(netdissect_options *, u_short, u_char);
  70 static void ddp_print(netdissect_options *, const u_char *, u_int, int, u_short, u_char, u_char);
  71 static const char *ddpskt_string(netdissect_options *, int);
  72
  73 /*
  74  * Print LLAP packets received on a physical LocalTalk interface.
  75  */
  76 u_int
  77 ltalk_if_print(netdissect_options *ndo,
  78                const struct pcap_pkthdr *h, const u_char *p)
  79 {
  80         return (llap_print(ndo, p, h->caplen));
  81 }
  82
  83 /*
  84  * Print AppleTalk LLAP packets.
  85  */
  86 u_int
  87 llap_print(netdissect_options *ndo,
  88            register const u_char *bp, u_int length)
  89 {
  90         register const struct LAP *lp;
  91         register const struct atDDP *dp;
  92         register const struct atShortDDP *sdp;
  93         u_short snet;
  94         u_int hdrlen;
  95
  96         if (length < sizeof(*lp)) {
  97                 ND_PRINT((ndo, " [|llap %u]", length));
  98                 return (length);
  99         }
 100         lp = (const struct LAP *)bp;
 101         bp += sizeof(*lp);
 102         length -= sizeof(*lp);
 103         hdrlen = sizeof(*lp);
 104         switch (lp->type) {
 105
 106         case lapShortDDP:
 107                 if (length < ddpSSize) {
 108                         ND_PRINT((ndo, " [|sddp %u]", length));
 109                         return (length);
 110                 }
 111                 sdp = (const struct atShortDDP *)bp;
 112                 ND_PRINT((ndo, "%s.%s",
 113                     ataddr_string(ndo, 0, lp->src), ddpskt_string(ndo, sdp->srcSkt)));
 114                 ND_PRINT((ndo, " > %s.%s:",
 115                     ataddr_string(ndo, 0, lp->dst), ddpskt_string(ndo, sdp->dstSkt)));
 116                 bp += ddpSSize;
 117                 length -= ddpSSize;
 118                 hdrlen += ddpSSize;
 119                 ddp_print(ndo, bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 120                 break;
 121
 122         case lapDDP:
 123                 if (length < ddpSize) {
 124                         ND_PRINT((ndo, " [|ddp %u]", length));
 125                         return (length);
 126                 }
 127                 dp = (const struct atDDP *)bp;
 128                 snet = EXTRACT_16BITS(&dp->srcNet);
 129                 ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, dp->srcNode),
 130                     ddpskt_string(ndo, dp->srcSkt)));
 131                 ND_PRINT((ndo, " > %s.%s:",
 132                     ataddr_string(ndo, EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 133                     ddpskt_string(ndo, dp->dstSkt)));
 134                 bp += ddpSize;
 135                 length -= ddpSize;
 136                 hdrlen += ddpSize;
 137                 ddp_print(ndo, bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 138                 break;
 139
 140 #ifdef notdef
 141         case lapKLAP:
 142                 klap_print(bp, length);
 143                 break;
 144 #endif
 145
 146         default:
 147                 ND_PRINT((ndo, "%d > %d at-lap#%d %u",
 148                     lp->src, lp->dst, lp->type, length));
 149                 break;
 150         }
 151         return (hdrlen);
 152 }
 153
 154 /*
 155  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 156  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 157  * packets in them).
 158  */
 159 void
 160 atalk_print(netdissect_options *ndo,
 161             register const u_char *bp, u_int length)
 162 {
 163         register const struct atDDP *dp;
 164         u_short snet;
 165
 166         if(!ndo->ndo_eflag)
 167             ND_PRINT((ndo, "AT "));
 168
 169         if (length < ddpSize) {
 170                 ND_PRINT((ndo, " [|ddp %u]", length));
 171                 return;
 172         }
 173         dp = (const struct atDDP *)bp;
 174         snet = EXTRACT_16BITS(&dp->srcNet);
 175         ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, dp->srcNode),
 176                ddpskt_string(ndo, dp->srcSkt)));
 177         ND_PRINT((ndo, " > %s.%s: ",
 178                ataddr_string(ndo, EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 179                ddpskt_string(ndo, dp->dstSkt)));
 180         bp += ddpSize;
 181         length -= ddpSize;
 182         ddp_print(ndo, bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 183 }
 184
 185 /* XXX should probably pass in the snap header and do checks like arp_print() */
 186 void
 187 aarp_print(netdissect_options *ndo,
 188            register const u_char *bp, u_int length)
 189 {
 190         register const struct aarp *ap;
 191
 192 #define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
 193
 194         ND_PRINT((ndo, "aarp "));
 195         ap = (const struct aarp *)bp;
 196         if (EXTRACT_16BITS(&ap->htype) == 1 &&
 197             EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
 198             ap->halen == 6 && ap->palen == 4 )
 199                 switch (EXTRACT_16BITS(&ap->op)) {
 200
 201                 case 1:                         /* request */
 202                         ND_PRINT((ndo, "who-has %s tell %s", AT(pdaddr), AT(psaddr)));
 203                         return;
 204
 205                 case 2:                         /* response */
 206                         ND_PRINT((ndo, "reply %s is-at %s", AT(psaddr), etheraddr_string(ndo, ap->hsaddr)));
 207                         return;
 208
 209                 case 3:                         /* probe (oy!) */
 210                         ND_PRINT((ndo, "probe %s tell %s", AT(pdaddr), AT(psaddr)));
 211                         return;
 212                 }
 213         ND_PRINT((ndo, "len %u op %u htype %u ptype %#x halen %u palen %u",
 214             length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
 215             EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen));
 216 }
 217
 218 /*
 219  * Print AppleTalk Datagram Delivery Protocol packets.
 220  */
 221 static void
 222 ddp_print(netdissect_options *ndo,
 223           register const u_char *bp, register u_int length, register int t,
 224           register u_short snet, register u_char snode, u_char skt)
 225 {
 226
 227         switch (t) {
 228
 229         case ddpNBP:
 230                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 231                 break;
 232
 233         case ddpATP:
 234                 atp_print(ndo, (const struct atATP *)bp, length);
 235                 break;
 236
 237         case ddpEIGRP:
 238                 eigrp_print(ndo, bp, length);
 239                 break;
 240
 241         default:
 242                 ND_PRINT((ndo, " at-%s %d", tok2str(type2str, NULL, t), length));
 243                 break;
 244         }
 245 }
 246
 247 static void
 248 atp_print(netdissect_options *ndo,
 249           register const struct atATP *ap, u_int length)
 250 {
 251         char c;
 252         uint32_t data;
 253
 254         if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
 255                 /* Just bail if we don't have the whole chunk. */
 256                 ND_PRINT((ndo, "%s", tstr));
 257                 return;
 258         }
 259         if (length < sizeof(*ap)) {
 260                 ND_PRINT((ndo, " [|atp %u]", length));
 261                 return;
 262         }
 263         length -= sizeof(*ap);
 264         switch (ap->control & 0xc0) {
 265
 266         case atpReqCode:
 267                 ND_PRINT((ndo, " atp-req%s %d",
 268                              ap->control & atpXO? " " : "*",
 269                              EXTRACT_16BITS(&ap->transID)));
 270
 271                 atp_bitmap_print(ndo, ap->bitmap);
 272
 273                 if (length != 0)
 274                         ND_PRINT((ndo, " [len=%u]", length));
 275
 276                 switch (ap->control & (atpEOM|atpSTS)) {
 277                 case atpEOM:
 278                         ND_PRINT((ndo, " [EOM]"));
 279                         break;
 280                 case atpSTS:
 281                         ND_PRINT((ndo, " [STS]"));
 282                         break;
 283                 case atpEOM|atpSTS:
 284                         ND_PRINT((ndo, " [EOM,STS]"));
 285                         break;
 286                 }
 287                 break;
 288
 289         case atpRspCode:
 290                 ND_PRINT((ndo, " atp-resp%s%d:%d (%u)",
 291                              ap->control & atpEOM? "*" : " ",
 292                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length));
 293                 switch (ap->control & (atpXO|atpSTS)) {
 294                 case atpXO:
 295                         ND_PRINT((ndo, " [XO]"));
 296                         break;
 297                 case atpSTS:
 298                         ND_PRINT((ndo, " [STS]"));
 299                         break;
 300                 case atpXO|atpSTS:
 301                         ND_PRINT((ndo, " [XO,STS]"));
 302                         break;
 303                 }
 304                 break;
 305
 306         case atpRelCode:
 307                 ND_PRINT((ndo, " atp-rel  %d", EXTRACT_16BITS(&ap->transID)));
 308
 309                 atp_bitmap_print(ndo, ap->bitmap);
 310
 311                 /* length should be zero */
 312                 if (length)
 313                         ND_PRINT((ndo, " [len=%u]", length));
 314
 315                 /* there shouldn't be any control flags */
 316                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 317                         c = '[';
 318                         if (ap->control & atpXO) {
 319                                 ND_PRINT((ndo, "%cXO", c));
 320                                 c = ',';
 321                         }
 322                         if (ap->control & atpEOM) {
 323                                 ND_PRINT((ndo, "%cEOM", c));
 324                                 c = ',';
 325                         }
 326                         if (ap->control & atpSTS) {
 327                                 ND_PRINT((ndo, "%cSTS", c));
 328                                 c = ',';
 329                         }
 330                         ND_PRINT((ndo, "]"));
 331                 }
 332                 break;
 333
 334         default:
 335                 ND_PRINT((ndo, " atp-0x%x  %d (%u)", ap->control,
 336                              EXTRACT_16BITS(&ap->transID), length));
 337                 break;
 338         }
 339         data = EXTRACT_32BITS(&ap->userData);
 340         if (data != 0)
 341                 ND_PRINT((ndo, " 0x%x", data));
 342 }
 343
 344 static void
 345 atp_bitmap_print(netdissect_options *ndo,
 346                  register u_char bm)
 347 {
 348         register char c;
 349         register int i;
 350
 351         /*
 352          * The '& 0xff' below is needed for compilers that want to sign
 353          * extend a u_char, which is the case with the Ultrix compiler.
 354          * (gcc is smart enough to eliminate it, at least on the Sparc).
 355          */
 356         if ((bm + 1) & (bm & 0xff)) {
 357                 c = '<';
 358                 for (i = 0; bm; ++i) {
 359                         if (bm & 1) {
 360                                 ND_PRINT((ndo, "%c%d", c, i));
 361                                 c = ',';
 362                         }
 363                         bm >>= 1;
 364                 }
 365                 ND_PRINT((ndo, ">"));
 366         } else {
 367                 for (i = 0; bm; ++i)
 368                         bm >>= 1;
 369                 if (i > 1)
 370                         ND_PRINT((ndo, "<0-%d>", i - 1));
 371                 else
 372                         ND_PRINT((ndo, "<0>"));
 373         }
 374 }
 375
 376 static void
 377 nbp_print(netdissect_options *ndo,
 378           register const struct atNBP *np, u_int length, register u_short snet,
 379           register u_char snode, register u_char skt)
 380 {
 381         register const struct atNBPtuple *tp =
 382                 (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
 383         int i;
 384         const u_char *ep;
 385
 386         if (length < nbpHeaderSize) {
 387                 ND_PRINT((ndo, " truncated-nbp %u", length));
 388                 return;
 389         }
 390
 391         length -= nbpHeaderSize;
 392         if (length < 8) {
 393                 /* must be room for at least one tuple */
 394                 ND_PRINT((ndo, " truncated-nbp %u", length + nbpHeaderSize));
 395                 return;
 396         }
 397         /* ep points to end of available data */
 398         ep = ndo->ndo_snapend;
 399         if ((const u_char *)tp > ep) {
 400                 ND_PRINT((ndo, "%s", tstr));
 401                 return;
 402         }
 403         switch (i = np->control & 0xf0) {
 404
 405         case nbpBrRq:
 406         case nbpLkUp:
 407                 ND_PRINT((ndo, i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:", np->id));
 408                 if ((const u_char *)(tp + 1) > ep) {
 409                         ND_PRINT((ndo, "%s", tstr));
 410                         return;
 411                 }
 412                 (void)nbp_name_print(ndo, tp, ep);
 413                 /*
 414                  * look for anomalies: the spec says there can only
 415                  * be one tuple, the address must match the source
 416                  * address and the enumerator should be zero.
 417                  */
 418                 if ((np->control & 0xf) != 1)
 419                         ND_PRINT((ndo, " [ntup=%d]", np->control & 0xf));
 420                 if (tp->enumerator)
 421                         ND_PRINT((ndo, " [enum=%d]", tp->enumerator));
 422                 if (EXTRACT_16BITS(&tp->net) != snet ||
 423                     tp->node != snode || tp->skt != skt)
 424                         ND_PRINT((ndo, " [addr=%s.%d]",
 425                             ataddr_string(ndo, EXTRACT_16BITS(&tp->net),
 426                             tp->node), tp->skt));
 427                 break;
 428
 429         case nbpLkUpReply:
 430                 ND_PRINT((ndo, " nbp-reply %d:", np->id));
 431
 432                 /* print each of the tuples in the reply */
 433                 for (i = np->control & 0xf; --i >= 0 && tp; )
 434                         tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
 435                 break;
 436
 437         default:
 438                 ND_PRINT((ndo, " nbp-0x%x  %d (%u)", np->control, np->id, length));
 439                 break;
 440         }
 441 }
 442
 443 /* print a counted string */
 444 static const char *
 445 print_cstring(netdissect_options *ndo,
 446               register const char *cp, register const u_char *ep)
 447 {
 448         register u_int length;
 449
 450         if (cp >= (const char *)ep) {
 451                 ND_PRINT((ndo, "%s", tstr));
 452                 return (0);
 453         }
 454         length = *cp++;
 455
 456         /* Spec says string can be at most 32 bytes long */
 457         if (length > 32) {
 458                 ND_PRINT((ndo, "[len=%u]", length));
 459                 return (0);
 460         }
 461         while ((int)--length >= 0) {
 462                 if (cp >= (const char *)ep) {
 463                         ND_PRINT((ndo, "%s", tstr));
 464                         return (0);
 465                 }
 466                 ND_PRINT((ndo, "%c", *cp++));
 467         }
 468         return (cp);
 469 }
 470
 471 static const struct atNBPtuple *
 472 nbp_tuple_print(netdissect_options *ndo,
 473                 register const struct atNBPtuple *tp, register const u_char *ep,
 474                 register u_short snet, register u_char snode, register u_char skt)
 475 {
 476         register const struct atNBPtuple *tpn;
 477
 478         if ((const u_char *)(tp + 1) > ep) {
 479                 ND_PRINT((ndo, "%s", tstr));
 480                 return 0;
 481         }
 482         tpn = nbp_name_print(ndo, tp, ep);
 483
 484         /* if the enumerator isn't 1, print it */
 485         if (tp->enumerator != 1)
 486                 ND_PRINT((ndo, "(%d)", tp->enumerator));
 487
 488         /* if the socket doesn't match the src socket, print it */
 489         if (tp->skt != skt)
 490                 ND_PRINT((ndo, " %d", tp->skt));
 491
 492         /* if the address doesn't match the src address, it's an anomaly */
 493         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 494                 ND_PRINT((ndo, " [addr=%s]",
 495                     ataddr_string(ndo, EXTRACT_16BITS(&tp->net), tp->node)));
 496
 497         return (tpn);
 498 }
 499
 500 static const struct atNBPtuple *
 501 nbp_name_print(netdissect_options *ndo,
 502                const struct atNBPtuple *tp, register const u_char *ep)
 503 {
 504         register const char *cp = (const char *)tp + nbpTupleSize;
 505
 506         ND_PRINT((ndo, " "));
 507
 508         /* Object */
 509         ND_PRINT((ndo, "\""));
 510         if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 511                 /* Type */
 512                 ND_PRINT((ndo, ":"));
 513                 if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 514                         /* Zone */
 515                         ND_PRINT((ndo, "@"));
 516                         if ((cp = print_cstring(ndo, cp, ep)) != NULL)
 517                                 ND_PRINT((ndo, "\""));
 518                 }
 519         }
 520         return ((const struct atNBPtuple *)cp);
 521 }
 522
 523
 524 #define HASHNAMESIZE 4096
 525
 526 struct hnamemem {
 527         int addr;
 528         char *name;
 529         struct hnamemem *nxt;
 530 };
 531
 532 static struct hnamemem hnametable[HASHNAMESIZE];
 533
 534 static const char *
 535 ataddr_string(netdissect_options *ndo,
 536               u_short atnet, u_char athost)
 537 {
 538         register struct hnamemem *tp, *tp2;
 539         register int i = (atnet << 8) | athost;
 540         char nambuf[256+1];
 541         static int first = 1;
 542         FILE *fp;
 543
 544         /*
 545          * if this is the first call, see if there's an AppleTalk
 546          * number to name map file.
 547          */
 548         if (first && (first = 0, !ndo->ndo_nflag)
 549             && (fp = fopen("/etc/atalk.names", "r"))) {
 550                 char line[256];
 551                 int i1, i2;
 552
 553                 while (fgets(line, sizeof(line), fp)) {
 554                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 555                                 continue;
 556                         if (sscanf(line, "%d.%d %256s", &i1, &i2, nambuf) == 3)
 557                                 /* got a hostname. */
 558                                 i2 |= (i1 << 8);
 559                         else if (sscanf(line, "%d %256s", &i1, nambuf) == 2)
 560                                 /* got a net name */
 561                                 i2 = (i1 << 8) | 255;
 562                         else
 563                                 continue;
 564
 565                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 566                              tp->nxt; tp = tp->nxt)
 567                                 ;
 568                         tp->addr = i2;
 569                         tp->nxt = newhnamemem(ndo);
 570                         tp->name = strdup(nambuf);
 571                         if (tp->name == NULL)
 572                                 (*ndo->ndo_error)(ndo,
 573                                                   "ataddr_string: strdup(nambuf)");
 574                 }
 575                 fclose(fp);
 576         }
 577
 578         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 579                 if (tp->addr == i)
 580                         return (tp->name);
 581
 582         /* didn't have the node name -- see if we've got the net name */
 583         i |= 255;
 584         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 585                 if (tp2->addr == i) {
 586                         tp->addr = (atnet << 8) | athost;
 587                         tp->nxt = newhnamemem(ndo);
 588                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 589                             tp2->name, athost);
 590                         tp->name = strdup(nambuf);
 591                         if (tp->name == NULL)
 592                                 (*ndo->ndo_error)(ndo,
 593                                                   "ataddr_string: strdup(nambuf)");
 594                         return (tp->name);
 595                 }
 596
 597         tp->addr = (atnet << 8) | athost;
 598         tp->nxt = newhnamemem(ndo);
 599         if (athost != 255)
 600                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet, athost);
 601         else
 602                 (void)snprintf(nambuf, sizeof(nambuf), "%d", atnet);
 603         tp->name = strdup(nambuf);
 604         if (tp->name == NULL)
 605                 (*ndo->ndo_error)(ndo, "ataddr_string: strdup(nambuf)");
 606
 607         return (tp->name);
 608 }
 609
 610 static const struct tok skt2str[] = {
 611         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 612         { nbpSkt,       "nis" },        /* name info socket */
 613         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 614         { zipSkt,       "zip" },        /* zone info protocol */
 615         { 0,            NULL }
 616 };
 617
 618 static const char *
 619 ddpskt_string(netdissect_options *ndo,
 620               register int skt)
 621 {
 622         static char buf[8];
 623
 624         if (ndo->ndo_nflag) {
 625                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 626                 return (buf);
 627         }
 628         return (tok2str(skt2str, "%d", skt));
 629 }